Process of preparing condensate from gases



Patented Mar. 29, 1 932 .sionand adsorption methods,

WILLEM JOHANNES noivuNrcus VAN nIJcx ANnj n nRix iinR n-Rimmmor- THE HAGUE, NETHERLANDS, ASSIGNORS TO 1NAAMLOOZE VENNOQ'ISGHA-P DE vga t;

, TAAFSGHE PETROLEUI ILMAATSCHAPII J, 'OF

EH H U zN' THER A S rnocnss or PREPARING co niNjsA rn r'RoM' Our invention relates to a processof preparing condensate from gases. Although .as such it is very widely applicable, it will. be described hereinafter, by Way of example,

in respect to the extraction of benzme (i. e. gasoline,

as occurring in the oil industry, such as cracking, destructive hydrogenating-, distilling, naturaland so-called casingheadgases, more particularly from the latter material to be specified hereinafter as wellgas.

It is known that some of the constituents of wellgas, i. e. thegas escaping from the casinghead' of oilwells, either ;in themselves or mixed with other similar substances yield a suitablebenzine for commercial-purposes.

These constituents are extracted from the said 7 gas by compression, ads'orption'or absorption. Now our invention relates to a process in which the yield of condensate by compreswhich both are based in principle on'condensation, can be increased in a very simple manner. \Ve

will specify our invention with reference to a description of the compression method,

but it should be understood that it likewise 7 applies to the adsorption method, which, as

is known, is carried out with the-aid of charcoal in adsorption towers and the like.

' WVhen applying the compression method to wellgas, this of one or more compound compressors to a pressure ranging between A} and 25 atmos and subsequently passed through one in'which it is exposed first to a temperature of about 30 C., and thereafter to a temperature of about 3 C. The constituents suitable for benzine, which are condensed during these treatments, are separated from the remaining constituents prespheres, or more coolers,

- ent in the gaseous phase and conducted to collecting tanks, whilst the gas drawno'fi separately. a p

. It has now been found that in the condensation methods hitherto known and applied not all of the'benzine inthe gas is extracted therefrom and the invention pro-- vides the way to obtain increased yields of benzine (gasoline'etcy In fact, the lnvention is basedon the fact,

etc.) from hydrocarbon gases gas is compressed by means urally in the gas.

that a more complete separation off thede siredconstituents takes place if careis when; that a 'com'ponentor group of components' havinga lower-boiling pointehan pl a boiling, compo ent of the constituents tome? extracted from the gas mixtureas conden sate, 1s present in e xcessag Eurthermorefthe said component or group of components-must gbe' capabl'e of maintaining }tliezliquid:state in the condensate 1'1nd'er---the" conditions "of theficondensatlon. i. l

I "It has previously been proposed "to mixwellgas-and similar gases with oil, as'a result of Wh1t3l1=th-t0tal vapour -pres sureojf'thefl mixture Li s-flowered" and a icert'ainamount of- 1 the constituents originally present an the gaseous phase is absorbed bythehigli -boiling?.

' "Inirespe'ct to this-known ,factth'e process"- according to the present invention is dis tingmsh'e'd Ab'y lowsb'oilin'g instead of-high;

boiling substancesbeing brOught intoco'rita'ct; j with the gas, g'1v1ng rise, t is tru'e,to an increase of the total vapourpressure'ybut on the other hand the low boiling substances "play a comparatively larger partin the'said vapor pressure, so that thehigh-fbo'iling substances; I

are present in the vapor iri arelatively,(qitei in respect ito" the state in which they only would be present) smaller quantityf and cone sequently in the-liquid inalargen-quantity.

The process according to ourinvention thus consists in that the. gas carrying the constituents to be condensed during the condensation, a substanceor group of substances is caused to be present in excess. (e. g.added;

to the mixture), the boiling point of which substance or entire group-of substances lies below that of the lowest-boiling constituents of the. groups of components which it is desired to obtain. 'Inaccordancewiththisin-' vention we add exclusively suchmaterials, and'not any products. ofhigher boiling point than the product tobe condensed. By ex-v cess in this case is meant that which is pres No; 469323; nd ntheji'reuijr anaf inte- '29; 1 9

ent over. and above the quantity present natl Thus, for instance, exclusively consisting of methane and homologues, such as ethane, propane,-butane, pen

in the case of a gas tane, hexane, etc., propane will be added to the gas if it is chiefly desired to obtain butane, pentane and higher homologues. The yield of the desired components will then be greater according as more'propane is present.

The r material to be added may 7 be derived from any suitable availablesource. In some I y cases it will be deemed preferable to obtain same from thegas under treatment by ap- 1i)v plying-a'process ofcirculationpin which the material is 'eitheraccumulated inthe system 7 or, subject to a. sufiicient amountbeing pres- I ent, continues to circulate therein. This proc 1 ess is specially recommendable when prepar-.

i'ngbenzine from wellgas, whereby a stabiliz er isprovided, which serves to remove the lowest-boiling consituents from the. condensi I required for the application of the process acf 2Q cording to the invention (e; grpropane) may and addedto the g' s entering the system. I :-Wha. w claim is: V J r A process of preparing ar condensate, 1 c 2 5 from a gas consisting largely of hydrocar-h bons initially carrying a'desire'dcondensable hydrocarbon substance in :the 'form;of a vapor, which comprises contacting the-gas 7' withlasubstance consisting exclusively of liquefiable components having boiling points;

a lower than that of the lowest boiling com ponent'of the condensate to be produced, in the absence of added constituents less vol- .atile than said condensate, and thereafter subjecting the mixture to a condensing operationinthe absence ofadded oilymaterials 'lessvolatile'than said condensate. V v 2. A process as covered in claim 1, inwhich the-gastreated is selected from the herein 7 4 described group consisting of casinghead gas, gases from oil distillation, 'gasesiiom oilcracking andgases from destructive hy-V drogenationfofhydrocarbons;: P r 1 In testimony whereof, we have aflixed' our signatures. V j

I WILLEN JOHVANNESDOMINICUS VANDIJCK.

,insumux HEERE RADIER. r

ffi 1,851,607

ate. f F rom these constituents the material p then; be separated in some suitable manner 7 i 

